TY - GEN
T1 - Flow and Combustion in a Supersonic Cavity Flameholder
AU - Cisneros-Garibay, Esteban
AU - Pantano, Carlos
AU - Freund, Jonathan B.
N1 - Publisher Copyright:
© 2022, American Institute of Aeronautics and Astronautics Inc. All rights reserved.
PY - 2022
Y1 - 2022
N2 - Detailed numerical simulations of both inert mixing and sustained combustion are analyzed for a cavity flameholder based on corresponding experiments. A M = 1 round ethylene jet fuels a cavity with length-to-depth ratio L/D = 3.5 and a 45◦ inclined downstream wall. Oxidizer mixes into the cavity from the M = 3 core flow. The simulations reproduce shock angles and wall pressures of the corresponding experiment. The effects that cavity combustion has on the core-flow gas dynamics and cavity entrainment are analyzed in detail. Relative to the inert case, heat release leads to a complex core flow, with upstream boundary layers transiently separating and highly unsteady shocks over the cavity. Their collective effect is the formation of a virtual throat, which decreases the core flow to M = 2 above the cavity. Lagrangian trajectories assess the roles that turbulence, combustion, and three-dimensional side-wall boundary layers have on oxidizer entrainment into cavity entrainment. Overall, sustained cavity combustion suppresses entrainment by a factor of about 2.
AB - Detailed numerical simulations of both inert mixing and sustained combustion are analyzed for a cavity flameholder based on corresponding experiments. A M = 1 round ethylene jet fuels a cavity with length-to-depth ratio L/D = 3.5 and a 45◦ inclined downstream wall. Oxidizer mixes into the cavity from the M = 3 core flow. The simulations reproduce shock angles and wall pressures of the corresponding experiment. The effects that cavity combustion has on the core-flow gas dynamics and cavity entrainment are analyzed in detail. Relative to the inert case, heat release leads to a complex core flow, with upstream boundary layers transiently separating and highly unsteady shocks over the cavity. Their collective effect is the formation of a virtual throat, which decreases the core flow to M = 2 above the cavity. Lagrangian trajectories assess the roles that turbulence, combustion, and three-dimensional side-wall boundary layers have on oxidizer entrainment into cavity entrainment. Overall, sustained cavity combustion suppresses entrainment by a factor of about 2.
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U2 - 10.2514/6.2022-1850
DO - 10.2514/6.2022-1850
M3 - Conference contribution
AN - SCOPUS:85123585113
SN - 9781624106316
T3 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022
BT - AIAA SciTech Forum 2022
PB - American Institute of Aeronautics and Astronautics Inc, AIAA
T2 - AIAA Science and Technology Forum and Exposition, AIAA SciTech Forum 2022
Y2 - 3 January 2022 through 7 January 2022
ER -